Kōsuke Iwasa is a Japanese professional baseball player known for his skills as a pitcher. He has played in various leagues, showcasing his talent and contributing to his teams' successes. Iwasa is recognized for his strong work ethic and dedication to the sport. Throughout his career, Iwasa has been associated with several teams, including those in the Nippon Professional Baseball (NPB) league. His performances have earned him a reputation among fans and fellow players, making him a notable figure in Japanese baseball.